399306913 has 8 divisors (see below), whose sum is σ = 412037640. Its totient is φ = 386718720.

The previous prime is 399306889. The next prime is 399306953. The reversal of 399306913 is 319603993.

It can be written as a sum of positive squares in 4 ways, for example, as 18939904 + 380367009 = 4352^2 + 19503^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 399306913 - 2²⁵ = 365752481 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 399306913.

It is not an unprimeable number, because it can be changed into a prime (399306953) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29928 + ... + 41161.

It is an arithmetic number, because the mean of its divisors is an integer number (51504705).

Almost surely, 2^399306913 is an apocalyptic number.

It is an amenable number.

399306913 is a deficient number, since it is larger than the sum of its proper divisors (12730727).

399306913 is a wasteful number, since it uses less digits than its factorization.

399306913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71267.

The product of its (nonzero) digits is 118098, while the sum is 43.

The square root of 399306913 is about 19982.6653127154. The cubic root of 399306913 is about 736.3804946434.

The spelling of 399306913 in words is "three hundred ninety-nine million, three hundred six thousand, nine hundred thirteen".